Secretion in the Diatoms

Aumeier, Charlotte; Menzel, Diedrik

doi:10.1007/978-3-642-23047-9_10

Cited by 12 publications

(4 citation statements)

References 87 publications

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“…Dense biofilms composed of epipelic diatoms form on fine-grained sediments (Sabbe 1993;Ribeiro et al, 2013). Epipelic diatoms live freely on and in sediments and possess a raphe structure through which mucilage is secreted allowing movement (Round et al, 1990;Aumeier & Menzel 2012). In addition to endogenous vertical migration rhythms in response to diurnal and tidal cycles (Consalvey et al, 2004), epipelic diatoms can also actively position themselves within sediment light gradients in order to maximize photosynthesis and/or avoid overexposure (Admiraal 1984;Serôdio et al, 2006;Cartaxana et al, 2016a).…”

Section: Introductionmentioning

confidence: 99%

Behavioural versus physiological photoprotection in epipelic and epipsammic benthic diatoms

Blommaert

Lavaud

Vyverman

et al. 2018

European Journal of Phycology

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Benthic diatoms are dominant primary producers in intertidal marine sediments, which are characterized by widely fluctuating and often extreme light conditions. To cope with sudden increases in light intensity, benthic diatoms display both behavioural and physiological photoprotection mechanisms. Behavioural photoprotection is restricted to epipsammic and epipelic groups suggests that other factors as well, such as cell size, substrate type and photoacclimation, may influence photoprotective strategies.

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Section: Introductionmentioning

confidence: 99%

Behavioural versus physiological photoprotection in epipelic and epipsammic benthic diatoms

Blommaert

Lavaud

Vyverman

et al. 2018

European Journal of Phycology

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“…However, diatoms differ drastically from green algae and fungi in terms of cell wall structure and biochemistry. The diatom cell wall (frustule) is formed by two silicified thecae, each composed of valves and girdle bands, and coated in mucilaginous organic polymers (Aumeier & Menzel, 2012; Schmid et al, 1981). Thus, it seems unlikely that the penetration of the diatom cell wall is mainly based on enzymatic dissolution, as is suspected for the protoplast feeders that consume green algae and fungi (Busch & Hess, 2017; Old et al, 1985).…”

Section: Discussionmentioning

confidence: 99%

Description of the marine predator Sericomyxa perlucida gen. et sp. nov., a cultivated representative of the deepest branching lineage of vampyrellid amoebae (Vampyrellida, Rhizaria)

Simpson

Hess

2021

J Eukaryotic Microbiology

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“…The cells are attached by secreting mucilage, probably originating from areolae or girdle band pores located on the footpole. In most cases, mucilage production occurs from pores at the apex of the cells (apical porefields) or through the raphe slit (Round et al 1990;Aumeier & Menzel 2012). Detailed information about the secretion of mucilage without specialized structures is however lacking, although some genera are able to form mucilage tubes, as can be observed in some species belonging to the genera Amphipleura, Cymbella, Gyrosigma, Navicula, and Nitzschia (Round et al 1990).…”

Section: Discussionmentioning

confidence: 99%

Analysis of the type material of Gomphosphenia tackei (Bacillariophyceae) and comparison to epizoic diatom populations on freshwater snails

Rybak¹,

Peszek²,

Poradowska³

2021

Pl. Ecol. Evol.

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Background and aims – Hustedt (1942) originally described Gomphosphenia tackei from Germany under the name Gomphonema tackei. Because of the small cell size and the lack of scanning electron microscopy (SEM) images from the type material, it is often confused with other species from this genus, especially with G. stoermeri. The aim of this paper was to present detailed morphological characteristics of G. tackei based on the analysis of the type material and of several epizoic populations from Central Europe. Material and methods – The material in this study was collected from the shells of the freshwater snails Lymnaea stagnalis, Planorbarius corneus, and Planorbis planorbis. Additionally, for an unambiguous species identification, the type material for Gomphosphenia tackei was analyzed using light and scanning electron microscopes.Key results – The presence of Gomphosphenia tackei was confirmed in the studied material. The largest population (up to 19%) was recorded on the shell surfaces of living snails, whereas on empty shells, the diatom did not seem to be present or only in very low numbers. Valves are typically clavate with rounded apices. Valves are frequently observed in girdle view, often joint together in pairs. The valves in the studied populations had a valve length of 7–29 µm, a valve width of 3–4 µm, and a stria density of 25–29 striae in 10 µm. In the type population, valve length ranged from 7.5 to 27 µm with a valve width of 3.0–4.0 µm and a stria density of 23–29 striae per 10 µm. Striae were composed of 2–4 elongated to rounded areolae per stria. At the apices, the striae were composed of one single areola. The cells were attached to the substratum by their footpole.Conclusion – Published illustrations of Gomphosphenia tackei do not always correctly represent this species. Individual cells are attached to the substratum by secreted mucilage, probably via their areolae or girdle band pores located on the footpole.

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Secretion in the Diatoms

Cited by 12 publications

References 87 publications

Behavioural versus physiological photoprotection in epipelic and epipsammic benthic diatoms

Behavioural versus physiological photoprotection in epipelic and epipsammic benthic diatoms

Description of the marine predator Sericomyxa perlucida gen. et sp. nov., a cultivated representative of the deepest branching lineage of vampyrellid amoebae (Vampyrellida, Rhizaria)

Analysis of the type material of Gomphosphenia tackei (Bacillariophyceae) and comparison to epizoic diatom populations on freshwater snails

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